kyverno-clusterpolicy-block-cluster-admin-openshift-etcd-ns-specific-subject.yaml

apiVersion: kyverno.io/v1
kind: ClusterPolicy
metadata:
  name: block-cluster-admin-openshift-etcd-ns
  annotations:
    policies.kyverno.io/title: Block Cluster Admin on Openshift-etcd Namespace
    policies.kyverno.io/category: Sample
    policies.kyverno.io/subject: RBAC
spec:
  validationFailureAction: enforce
  background: false
  rules:
  - name: block-cluster-admin-openshift-etcd-ns
    match:
      any:
      - resources:
          kinds:
          - "*"
          namespaces:
          - openshift-etcd
        clusterRoles:
        - cluster-admin
        subjects:
        - kind: User
          name: test
    validate:
      message: "The cluster-admin 'test' user cannot touch Openshift-etcd Namespace."
      deny:
        conditions:
          any:
            - key: "{{request.operation || 'BACKGROUND'}}"
              operator: AnyIn
              value:
              - CREATE
              - UPDATE
              - DELETE